Sand-paper



(Specimens.)

W. A. LORENZ SAND PAPER.

N0, 440517. v Patented NOV. 11, 1890.

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NITED STATES PATENT OFFICE.

XVILLIAM A. LORENZ, OF HARTFORD, CONNECTICUT, ASSIGNOR OF ONE- HALF TO HERMAN BEHR, OF BROOKLYN, NEW YORK.

S A N D PA P E R SPECIFICATION formingpart of Letters Patent No. 440,317, dated November 11, 1890.

Application filed March 19, 1888- Serial No. 267,619. (Specimens) T at whom it may concern.-

Be it known that I, WILLIAM A. LORENZ, of Hartford, Connecticut, have invented a new and useful Improvementin Sand-Paper, of which the following description and claim constitute the specification, and which is illustrated by the accompanying sheet of draw- Ings.

This invention consists in a new and useful kind of sand-paper.

Figure 1 of the drawings is aview of a piece of my improved sand-paper with the sanded surface generally uppermost, but with the back of the sanded surface turned up to view at the right of the figure. Fig. 2 is an enlarged cross-section of a piece of sand-paper such as has generally been used. Fig. 3 is an enlarged cross-section of a piece of my improved sand-paper.

The letter A indicates a piece of my improved sand-paperfinished, as shown in Fig. l.

The letter B indicates the paperbase of the sand-paper of Figs. 2 and 3, respectively,while the letter 0 indicates the glue, by means of which the particles of sand are fastened to the paper base; and the letter D indicates the particles of sand themselves.

A suitable process of making myimproved sand-paper consists in passing the sanded paper with the sanded side upward between two rollers, the upper one of which has a hard surface and the lower one of which has a surface of soft vulcanized rubber or other elastic material, which yields to the downward pressure of the particles of sand which is exerted through the paper base, so that those particles are embedded in the paper base and the paper base is pebbled thereby, substantially as shown in Fig. 3. The special merit of my improved sand-paper consists in several pa'rticulars. The particles of sand, being embedded in separate concavities in the upper surface of the paper base, are more firmly held in position against the friction which they must withstand in use than they can be where they are not thus embedded; and my improved sand-paper of Fig. 3 can be manufactured with less glue than the sand-paper of Fig. 2, because the interstices between the various particles of sand are diminished in size by the upward pressure of those portions of the surface of the lower roller that lie directly under those interstices.

I claim as my inventi0n- Sand-paper consisting of a base of pebbled paper and of particles of sand embedded in the concavities in the upper surface of the pebbled base and united to the pebbled base by glue, all substantially as described.

WILLIAM A. LORENZ.

Witnesses:

ALBERT H. WALKER, HENRY L. RECKARD. 

